Alphabet’s self-driving car company, Waymo, is suing Uber for “misappropriating Waymo trade secrets and infringing our patents,” the company said in a blog post.

Waymo says it has evidence that Uber and its subsidiary Otto, which was started by former Google employees, has Waymo’s proprietary LiDAR technology. First, Otto’s LiDAR circuit boards, as revealed to Waymo via an email from one of its suppliers, looked very similar to Waymo’s. Secondly, the company says it discovered that former employee and Otto cofounderAnthony Levandowski had downloaded 14,000 confidential design files before leaving. Another former employee allegedly downloaded information about the supply chain needed to build Waymo’s LiDAR.

When reached for comment an Uber spokesperson said, “We take the allegations made against Otto and Uber employees seriously and we will review this matter carefully.”